聚氧丙烯醚的非等温热分解动力学及寿命

利用热重(TG)分析技术对聚氧丙烯醚的热失重行为进行了研究.采用非等温TG-DTG技术，在5.0、10.0、15.0和20.0 K/min线性升温速率和空气气氛条件下，考察了聚氧丙烯醚的非等温热分解机理及反应动力学.运用Freeman-Carroll、Kissinger、Ozawa、Coats-Redfern和Achar等方法对非等温动力学数据进行分析，确定了聚氧丙烯醚热分解反应的机理函数为Mampel Power法则(m=1)，对应机理为幂函数法则，其表观活化能为62.5 kJ/mol，指前因子为106.17 s-1.同时采用等温TG技术得到失重10%和15%为寿终指标的寿命方程.

Non-isothermal decomposition kinetics and lifetime of polyoxypropylene ether

Thermogravimetric(TG) analysis was used to study the pyrolysis characteristics of polyoxypropylene ether.The thermal decomposition kinetics of polyoxypropylene ether was investigated by means of non-isothermal TG-DTG at different heating rates of 5.0,10.0,15.0,and 20.0 K/min in a stream of air.The mechanism function was identified with the kinetic parameters obtained from the analysis of TG-DTG curves by the Freeman-Carroll method,the Kissinger method,the Ozawa method,the Coats-Redfern method and the Achar method.The most probable kinetic function of the thermal decomposition is the exponential function with m=1,and the corresponding machanism follows Mampel Power theorem.The apparent activation energy and the pre-exponential constant are 62.5 kJ/mol and 10~(6.17) s~(-1) respectively.The lifetime equation at weight-loss of 10% and 15% were deduced by isothermal TG(analysis.)